I enjoy working with this thread. It drapes beautifully and you never have to worry about fraying. I've used this with bead sizes 8/0, 10/0, 11/0, and 15. I've also used it with Swarovski crystals, and the glass edges have never cut the thread. While it's more expensive than regular nylon thread, I think it's worth it.
TIP: I cut this thread with children's scissors. Someone told me that several years ago and it always works. (Cutting it with my regular beading scissors doesn't work well.) There is now a cutter made specifically for Fireline and similar threads, but why spend the extra money when a cheap pair of kindergarten scissors does the job perfectly?
With the four-pound Fireline, you don't have to worry about cutting it on a slant like you sometimes need to do with the thicker Fireline, and it works well with both 10 and 11 needles (being larger, the 10s are of course a bit easier). After cutting it, I run it through Thread Heaven. I don't think they make that thread conditioner anymore, but any thread conditioner should work.
The crystal color is your basic white.